Constraint-Based Assessment of CTOD Toughness Requirement For High-Strain Line Pipe
Constraint-Based Assessment of CTOD Toughness Requirement For High-Strain Line Pipe
复制标题
基于约束的高应变管线管 CTOD 韧性要求评估
DOI：
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发表时间：
2011
影响因子：
0.8
通讯作者：
M. Ohata
中科院分区：
文献类型：
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作者：
F. Minami;Yasuhito Takashima;M. Ohata
针对高设计系数的高强度高应变管线焊接接头，讨论了基于约束的CTOD韧性要求评估方法。高内压引起的双轴载荷以及基体与焊缝金属之间的强度失配会对管道构件裂纹的CTOD和应力场产生影响。然而，与具有深裂纹的断裂韧性试样相比，管道构件遭受了显著的约束损失。验证了ISO 27306中用于约束损失CTOD校正的等效CTOD比，可适用于除深裂纹和充分超匹配条件外的高应变线管。使用该材料，可以在很大程度上放宽对管道构件的CTOD韧性要求。
The constraint-based assessment of the CTOD toughness requirement is discussed for welded joints of high-strength high-strain line pipes with a high design factor. The biaxial loading caused by a high internal pressure and the strength mismatch between the base and weld metals exert influences on the CTOD and stress fields of a crack in the pipe component. Nevertheless, the pipe component suffers from a significant constraint loss compared with the fracture toughness specimen with a deep crack. It is confirmed that the equivalent CTOD ratio, , standardized in ISO 27306, for the CTOD correction for constraint loss can be applied to high-strain line pipes except for a deep crack and sufficiently overmatch condition. Using , the CTOD toughness requirement for the pipe component can be relaxed to a large extent.